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Dictionary

transi'tion el"ement

Chem.
any element in any of the series of elements with atomic numbers 21–29, 39–47, 57–79, and 89–107, that in a given inner orbital has less than a full quota of electrons. Also called transi'tion met"al.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

transition area

transition probability

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